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Re: Variable Capacitance and Inductance

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

Ed: you are correct the gradient dose not change physical capacitance
dimensions, but we measure the effect of capacitance with the static charge
on the plates of a capacitor and the change of charge and frequency of a
circuit which is altered by surounding forces of charge. That is why an
oscilator circuit is placed inside a shield can to minimize these effects.
As long as we measure capacitance by its effect we will see changes in
measured results even tho the dimensions havent changed.
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Fri, 24 May 2002 19:16:46 -0600
> To: tesla-at-pupman-dot-com
> Subject: Re: Variable Capacitance and Inductance
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Fri, 24 May 2002 19:27:13 -0600
> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <evp-at-pacbell-dot-net>
> Tesla list wrote:
>> Original poster: "rheidlebaugh by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>
>> Jim: I believe if you measure the electrostatic gradient of the earth you
>> will be quite impressed how large the charge change with elevation is. The
>> change is large enough to measure changes in cm of height from the earth
>> surface. It has been used to control wing level on drone aircraft.
>> Robert  H
> The electric field gradient does indeed vary with altitude, but that's
> due to geometric effects and has nothing to do with capacitance.  The
> use of field measurements for attitude control was first done by RC
> model enthusiasts, more than 20 years ago, and does indeed give a useful
> degree of level sensing.
> Ed